System and method for grinding bauxite by dry method
A dry grinding and bauxite technology, applied in grain processing and other directions, can solve the problems of high energy consumption and grinding body consumption, low grinding efficiency, large circulation volume, etc., and achieve high grinding efficiency, reduce energy consumption and The effect of grinding body consumption and large ventilation area
Inactive Publication Date: 2010-04-14
HANGZHOU JINJIANG GROUP
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Problems solved by technology
However, the common disadvantages of the two processes are that the one-time grinding efficiency is low, the circulation volume is large, the wear is serious, and the energy consumption and grinding body consumption are large.
Method used
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Embodiment 1
[0049] First take typical samples for grindability and abrasiveness tests to determine the type of vertical roller mill. The grindability test is carried out in accordance with the building materials industry standard "Test Method for Grindability of Cement Raw Materials". The abrasiveness test equipment manufacturers also have some specific methods according to their own equipment characteristics. The principle is to grind a part of the material under the same conditions to test the grinding disc and grinding roller. Abrasiveness is determined by the amount of metal loss. Shenyang Heavy Machinery Design and Research Institute is entrusted with the test and selection report on bauxite as follows:
[0050] Material composition: Bauxite 90%
[0051] Quicklime 10%
[0052] Particle size: 0~8mm
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Abstract
The invention relates to a system and a method for grinding bauxite by a dry method, wherein the system comprises a vertical roller mill used for grinding bauxite material, the vertical roller mill is internally provided with a powder selecting device, the lower part thereof is provided with an air inlet, the upper part thereof is provided with a discharge hole, air entering from the air inlet forms ring-shaped air in the vertical roller mill and enters the powder selecting device by carrying ground mineral powder, and then the ring-shaped air is discharged from the discharge hole by carrying the qualified mineral powder; and the method comprises the following steps: bauxite material is fed into the vertical roller mill from a feed port to conduct dry-method grinding, ground mineral powder is carried by air entering from the air inlet at the lower part of the vertical roller mill and then enters the powder selecting device at the inner upper part of the vertical roller mill, after separation, the mineral powder with proper particle size enters a dust collecting device connected at the discharge hole at the upper part of the vertical roller mill through the discharge hole, and the dust collecting device collects the mineral powder. The invention simplifies the ore grinding grading process flow of the bauxite, leads operation and maintenance to be more convenient, and simultaneously greatly reduces the energy consumption of unit grinding product, and consumption of a grinding body, thus obtaining more uniform products.
Description
technical field [0001] The invention relates to the grinding technology of bauxite, in particular to a system and method for dry grinding bauxite. Background technique [0002] Bauxite grinding is an important process of alumina production. Usually, the bauxite mined from the mine is crushed to a size of 15-20mm by coarse crushing and medium-fine crushing, and then sent to the alumina factory for raw ore slurry preparation. my country's bauxite basically belongs to the diaspore type bauxite, which has mineralogy characteristics such as high aluminum, high silicon, low iron, medium hard, insoluble, etc. The method attaches great importance to the grinding process and equipment selection. [0003] After retrieval, the current patents on bauxite grinding process and equipment include: 96120493.1 "a raw ore slurry preparation method for producing alumina by Bayer process", 200510003164.0 "a grinding and classification process technology for alumina raw material bauxite ", 20051...
Claims
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Inventor 冯雨田马海军张雄
Owner HANGZHOU JINJIANG GROUP